Transcription of Water Quality-Based Effluent Limits
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Water Quality-Based Effluent Limits
Chapter 6 Water Quality-Based EffluentLimitsPermit writers must consider the impact of every proposed surface waterdischarge on the quality of the receiving Water . Water quality goals for a Water bodyare defined by State Water quality standards. A permit writer may find, by analyzingthe effect of a discharge on the receiving Water , that technology-based permit limitsare not sufficiently stringent to meet these Water quality standards. In such cases, theCWA and EPA regulations require development of more stringent, Water quality -basedeffluent Limits (WQBEL) designed to ensure that Water quality standards are met.
Water quality standards are composed of three parts: • Use classifications • Numeric and/or narrative water quality criteria • Antidegradation policy. Each of these three components is described below. Use Classification The first part of a State’s water quality standard is a classification system for
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